USB/SD input---------have USB Flash Drive and Secure Digital Card Decoder, when you plug the MOBILE DISK having a USB port(like MP3 player, MP4 player, USB Flash Drive, or Secure Digital Card) into the H-03A and hook it onto your home speakers and you will be listen to beautiful music.

CD/DVD input--------can be connected to CD/DVD players.
MP3/PCinput-------- Just connect your Portable Player (such as MP3, MP4 player etc) into the AMPLIFIER and hook it onto your home speakers and you will be astounded with the music quality.
AUX line input----- can connected to CD/DVDplayer, or Mp3 player or others.

Specially fitted with earphone outputting function, able for direct use of earphone to listen to tube amplifier (the impedance of earphone must between 32ohm-600ohm) .
It is not only a headphone amplifier , a MP3 amplifier , but also a pre-amplifier .